<template>
    <div class="">
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"> </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs
                    v-model="activeIndex"
                    :tab-position="'left'"
                    :before-leave="beforeTabLeave"
                    @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                :options="catelist"
                                :props="cateProps"
                                v-model="addForm.goods_cat"
                                @change="handleChange"></el-cascader>
                        </el-form-item>
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox
                                    :label="cb"
                                    v-for="(cb, i) in item.attr_vals"
                                    :key="i"
                                    border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input
                        ></el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片 要上传到的后台API 地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture-card"
                            :headers="headerObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" class="previewImg" />
            <span slot="footer" class="dialog-footer"> </span>
        </el-dialog>
    </div>
</template>

<script>
    import _ from 'lodash';
    export default {
        data() {
            return {
                activeIndex: '0',
                // 添加商品的表单数据对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属的分类数组
                    goods_cat: [],
                    // 图片的数组
                    pics: [],
                    // 商品的详情描述
                    goods_introduce: '',
                    attrs: [],
                },
                //表单验证规则
                addFormRules: {
                    goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
                    goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
                    goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
                    goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
                    goods_cat: [{ required: true, message: '请选择商品', trigger: 'blur' }],
                },

                // 商品分类列表
                catelist: [],
                //
                cateProps: {
                    expandTrigger: 'hover',
                    label: 'cat_name',
                    value: 'cat_id',
                    children: 'children',
                },
                //动态参数列表数据
                manyTableData: [],
                //静态属性列表数据
                onlyTableData: [],
                // 上传图片的url地址
                uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers请求头对象
                headerObj: {
                    Authorization: window.sessionStorage.getItem('token'),
                },
                //
                previewPath: '',
                previewVisible: false,
            };
        },
        created() {
            this.getCateList();
        },
        methods: {
            // 获取所有商品分类数据
            async getCateList() {
                const { data: res } = await this.$http.get('categories');
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品分类数据失败');
                }
                this.catelist = res.data;
            },
            // 级联选择器选中项变化 会触发这个函数
            handleChange() {
                console.log(this.addForm.goods_cat);
                if (this.addForm.goods_cat.length !== 3) {
                    this.addForm.goods_cat = [];
                }
            },
            //
            beforeTabLeave(activeName, oldActiveName) {
                if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                    this.$message.error('请先选择商品分类');
                    return false;
                }
            },
            async tabClicked() {
                // 证明访问的是动态参数面板
                if (this.activeIndex === '1') {
                    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: { sel: 'many' },
                    });
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取动态参数列表失败');
                    }
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');
                    });
                    this.manyTableData = res.data;
                } else if (this.activeIndex === '2') {
                    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: { sel: 'only' },
                    });
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取静态属性失败');
                    }
                    this.onlyTableData = res.data;
                }
            },
            // 处理图片预览效果
            handlePreview(file) {
                this.previewPath = file.response.data.url;
                this.previewVisible = true;
            },
            // 处理移除图片的操作
            handleRemove(file) {
                //1. 获取将要删除的图片的临时路径
                const filePath = file.response.data.tmp_path;
                //2.从 pics数组中，找到这个图片对应的索引值
                const i = this.addForm.pics.findIndex(x => x.pic === filePath);
                //3.调用数组的splice方法 把图片信息对象，从pics数组中移除
                this.addForm.pics.splice(i, 1);
            },
            // 监听图片上传成功的事件
            handleSuccess(response) {
                //1. 拼接得到一个图片信息对象
                const picInfo = { pic: response.data.tmp_path };
                //  将图片信息对象，push到pics数组中
                this.addForm.pics.push(picInfo);
            },
            // 添加商品
            add() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) {
                        return this.$message.error('请填写必要的表单项');
                    }
                    // 执行添加的业务逻辑
                    // lodash cloneDeep(obj)
                    const form = _.cloneDeep(this.addForm);
                    form.goods_cat = form.goods_cat.join(',');
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') };
                        this.addForm.attrs.push(newInfo);
                    });
                    // 处理静态属性
                    this.onlyTableData.forEach(item => {
                        const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals };
                        this.addForm.attrs.push(newInfo);
                    });
                    form.attrs = this.addForm.attrs;
                    console.log(form);
                    // 发起请求添加商名称
                    // 商品名称 必须是唯一的
                    const { data: res } = await this.$http.post('goods', form);
                    if (res.meta.status !== 201) {
                        return this.$message.error('添加商品失败！');
                    }
                    this.$message.success('添加商品成功！');
                    this.$router.push('/goods');
                });
            },
        },
        computed: {
            cateId() {
                if (this.addForm.goods_cat.length === 3) {
                    return this.addForm.goods_cat[2];
                }
                return null;
            },
        },
    };
</script>

<style lang="less" scoped>
    .el-checkbox {
        margin: 0 10px 0 0 !important;
    }
    .previewImg {
        width: 100%;
    }
    .btnAdd {
        margin-top: 15px;
    }
</style>
